SKYDEX upgrade kitGreat system. Tried foam initially, not satisfied... weak padding, and hot. Ordered SKYDEX kit, much higher quality. BE ADVISED: Kit size 8 is thicker pads (1 inch thick) for tighter fit/smaller heads. Kit size 6 is smaller pads (3/4 inch thick) for looser fit/larger heads. Also, kit does not come with instructions so you will have to seek them online or figure it out yourself. But in the end, much higher quality padding than foam. I feel substantially better-protected.